In the following passage was the use of their in the phrase
" in thier being force fed'' or it was correct that the author
used (them) in stead of thier ?

and what is meant exactly by "'it was'nt untill"'

while they went on hunger strike (refused to eat), which resulted in their being force fed (food was sent into their mouth through a tube). Eventually in 1918 women with property (who actually owned a house or land) aged 30 had the right to vote and it wasn't until 1928 that this right extended to all women so that in terms of suffrage they had equality with men. But this was only the beginning.